Screen or sieve for drying purposes



'Se t. 1

p 13 927 A. GOBIET lSCREENV OR SIEVE FOR DRYING PURPOSES Filed April 154 1927 Patented Sept. 13, 1927.

UNITED STATES ALFRED GOBIET, OF KARWIN, CZECHOSLOVAKIA.

SCREEN OR SIEVE FOR DRYING PURPOSES.

Application filed April 15, 192'?, Serial No. 184,081, and in Czechoslovakia April 12, 1926.

The present invention has for its object a screen or sieve in which the wires form heating resistance elements, so that the material which is to be screened is dried simulltaneously during the screening operation. As with a screen of this type in use it has been noticed that the stretched screen becomes loose due to the expansion of the individual wires under heat. and consider- -l ably reduces the screening effect, I form the screen. frame of relatively movable interconnected members, which members' move under the action of tension elements. These tensionv elements are advantageously comrent and may consist of compression springs.

In the appended drawing, an example of construction of the invention is illust-rated.

Figure 1 is a vertical cross section, and

Figure 2 is a horizontal cross section otra portion of the new arrangement.

The `Wire screen l may be made in the usual way from brass or steel wire of suitable gauge. This screen is stretched in a frame of relatively adjustable frame members, each of which, in the example ofconstruction illustrated, consists of angle iron members 2, and square iron rods 3. Only one frame member is illustrated in the drawings as these members are of duplicate construction and may be connected together for relative movement by any of the well known connec* tions commonly employed for such purposes. The current leads 4 which, in the example of construction, consist of screws, are inserted into the square iron rods 3. In this example of construction a strong compression spring 5 is disposed around the current lead 4. A two-part case 6, 7, is provided to protect the spring 5. The whole screen may be built up in a oating frame which may be comprised of the wooden standard or arm 8.

The current leads 4, as well as the screws, are connected to the conducter 9, whichl is bined with the device for supplying the cur` rality of these tension devices must necessarily be connected to at least two opposing members of the frame although, if desired, tension devices may be applied to all of the frame members instead of only two.

The method of operation can be easily understood, the screen working in 'exactly the same manner as any electrical heating resistance. As the spring 5 on the current lead 4 exerts a pressure in the direction of the arrow, which takes the form of a pull on the frame parts 3, the screen is always maintained automatically under tension. When the screen expands under heat, the frame 3 yields to the spring pressure and the tension of the screen is preserved. The case 6 protects the spring 5 from foreign matter, and particularly when the device is used for sifting coal dust or the like it prevents the entry ofvdirt which would impair the elasticity.

I claim:

A screen of the electrically heated type comprising a screen carrying frame formedl of relatively movable members, current conduct-ors attached to and projecting outward` ly from certain of said members and tension devices including springs encircling said conductors and arranged to exert outward pressure thereon.

Dated this 9th day of March, 1927.

l In testimony whereof I atlix my signature.

ING. ALFRED GOBIET. 

